We attempted a 10 a.m check in on July 3. Our return flight on AA was scheduled for 2:45 p.m. No one was at the AA counters. We went to the AA info booth near the entrance and were told that 3 hours was the maximum time that we could check in ahead of our flight. They even suggested that we wait until 12:30 or so. Thank goodness we ignored them and came back at 11:45 and got our luggage checked in just before the airport evacuation that day. Saved a lot of hassle.